package cn.hdu.liang.io;

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Pattern;

class DirFilter implements FilenameFilter {
    private Pattern pattern;

    public DirFilter(String regex) {
        pattern = Pattern.compile(regex);
    }

    @Override
    public boolean accept(File dir, String name) {
        return pattern.matcher(name).matches();
    }
}

public class DirList {
    public static void main(String[] args) {
        File path = new File("src/cn/hdu/liang/io");
        //String[] list = path.list(new DirFilter("D.*\\.java"));
        String[] list = path.list((dir, name) -> Pattern.compile("D.*\\.java").matcher(name).matches());
        Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
        for(String dirItem : list) {
            System.out.println(dirItem);
        }
    }
}